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J. W. SHAFER. CLAY TBMPERING AND EXPRESSING DEVICE FOR BRICK MACHINES.

No. 306,536. Patented Oct. 14, 1884.

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JoHN w. SHAFER, on PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CYRUS CHAMBERS, JR, or SAME PLAon.

CLAY TEMPERING AND EXPRESSING DEVICE FOR BRICK-MACHINES.

SPECIFICATION forming part of Letters Patent No. 306,536, dated October 14, 18184.

Application filed June 28, 1884. (No model.)

To all whom it may concern.-

Be it known that I, JOHN W. SHAFER, a citizen of the United States, residing at Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Clay Tenipering and Expressing Devices for Briclelllachines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

My improvement relates to the clay-tempering knives used in that class of brick-machines wherein the clay is tempered and forced out from a case through a die by the aid of a series of inclined knives mounted on a shaft rotating within said casesucl1, for example, as in what are known as Ghambers Brick- Machines, described in the Letters Patent of Cyrus Chambers, J r., No. 207,343, dated August 27 187 8, and other Letters Patent granted to him. I

The invention consists in constructing said knives in two separable conjoined parts, the one constituting the shank portion, and the other, upon which the greater part of the at trition of the clay operates to wear-the blades away, preferably of chilled iron or other comparatively hardor wear-resisting metal, whereby such part may readily be renewed when worn out.

Figure 1 of the annexed drawings represents aportion of the pugging-shaft of a Chambers machine provided with my improved tempering-knives. Fig. 2 is a side elevation of one of the tempering-knives detached, looking at the forward or working side of the blade. Fig. 3 is aview of the back of the knife. Fig. 4 is an elevation similar to Fig. 2, but of the opposite side of the knife. Fig. 5 is asection on the line a I), Fig. l.

The same letters indicate the same parts in' the several figures.

A marks the blade, and 13 its shank, which is adapted to be inserted into a hole in front of the usual reenforces, r, in the shaft 0,

Fig. 1, being secured in place by a key, (I. 5 The shank broadens out at e, forming, in fact,

a part of the blade, and is made with an offset,

as shown, to which the blade proper, A,which has corresponding offsets, is fitted. PartAis made preferably of chilled iron, and is firmly secured to the expansion 6 of the shank by means of a bolt, f, whose head h islet into a socket in the front face of the blade, so that it will come flush therewith. A nut, n. on the threaded end of the bolt serves to draw together and retain the parts. The bolt, in con nection with the manner in which the parts are fitted together, retains the blade A securely in position against the severe lateral and back strain to which it is subjected in plowing through and moving forward the body of clay. Vhen the blade wears away, itis the work of a moment to replace it with another of the same kind.

I claim as new and wish to secure by patent 6 1. A tempering-knife for brick-machines, composed of two separable parts, with means for securing said parts together, substantially as and for the purpose specified.

2. A temperingknife for brick-machines, formed of two separable parts, one of which that is, the part subjected to the greater wear-- is of chilled iron, together with means for se curing said parts together, substantially as and for the purpose set forth. 7-

In a tempering-knife, the combination of the shank portion and the detachable blade portion, said shank and blade beingprovided with corresponding offsets, and secured together by means of a bolt, substantially as and for the purpose specified.

In testimony whereof I have hereunto affixed my signature this 15th day ofApril, A.

- JOHN XV. SHAFER.

\Vitnesses:

JAMns R. MAG-ulna, J. H. CHAMBERS. 

